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Efficiency Optimization Method of Full-bridge LLC Resonant Converter under Light Load Condition
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Ke WANG1, Jing PENG1, Xu-xin ZHANG2, *, Yu-wei DU3
Science Technology and Engineering | 2025, 25(9) : 3704 - 3711
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Science Technology and Engineering | 2025, 25(9): 3704-3711
• Papers·Electrical Technology •
Efficiency Optimization Method of Full-bridge LLC Resonant Converter under Light Load Condition
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Ke WANG1, Jing PENG1, Xu-xin ZHANG2, *, Yu-wei DU3
Affiliations
  • 1 Electric Power Science Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650214, China
  • 2 Xi’an Microelectronics Technology Research Institute, Xi’an 710018, China
  • 3 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Published: 2025-03-28 doi: 10.12404/j.issn.1671-1815.2405247
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For full-bridge LLC resonant converter, intermittent control strategy is an effective means to improve its light load efficiency. An improved intermittent control method was proposed to solve the problems of limited efficiency improvement and large output voltage ripple in light load state of converter by traditional intermittent control. This control method fixes the intermittent conduction time and makes the converter work at the resonant frequency during the intermittent conduction time, which further improves the light load efficiency of the converter and reduces the output voltage ripple. In order to verify the feasibility of the proposed method, a simulation model was built and the simulation waveforms of the traditional intermittent control strategy and the improved intermittent control strategy were compared and analyzed, and an experimental prototype with rated power of 100 W was made. The simulation and experimental results show that the output voltage ripple of the full-bridge LLC resonant converter with the improved intermittent control strategy can meet the engineering requirements, and compared with the traditional intermittent control strategy, the efficiency under light load is improved by up to 4.1%.

LLC  /  light load efficiency  /  efficiency optimization  /  burst control
Ke WANG, Jing PENG, Xu-xin ZHANG, Yu-wei DU. Efficiency Optimization Method of Full-bridge LLC Resonant Converter under Light Load Condition[J]. Science Technology and Engineering, 2025 , 25 (9) : 3704 -3711 . DOI: 10.12404/j.issn.1671-1815.2405247
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Article Info
doi: 10.12404/j.issn.1671-1815.2405247
  • Receive Date：2024-07-12
  • Online Date：2025-07-09
  • Published：2025-03-28
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  • Received：2024-07-12
  • Revised：2024-12-31
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Affiliations
    1 Electric Power Science Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650214, China
    2 Xi’an Microelectronics Technology Research Institute, Xi’an 710018, China
    3 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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